Utility knife



FIG. 1 is a front perspective view of the utility knife showing the new design;

FIG. 2 is a rear perspective view thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a rear elevation view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a left elevation view thereof; and,

FIG. 8 is a right elevation view thereof.

The broken lines illustrate environment and form no part of the claimed design. 

CLAIM The ornamental design for a utility knife, as shown and described. 